[PSUBS-MAILIST] Shaft seals

[hank pronk via Personal_Submersibles]

Brian,The boat shaft seal is a low pressure version of a mechanical seal.  Just google mechanical seal or cartridge seal.  That is what I have in my thrusters-if your building a thruster housing with some size to it they are ideal.  The smallest I have seen are what I have at 7\8 shaft size and 1 1\8 seat size.  If your building from scratch, they would be the way to go.  I bought my seals on eBay as new old stock for 200 dollars for the pair.  I would find seals like that for cheap and build the shaft etc to suit the seals.  No need for oil filling or pressure compensating of any type with these seals.Hank 

    On Friday, June 24, 2016 10:29 PM, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
 

 Hi All,                 I was wondering if anyone is familiar with the PSS shaft seal system.   I've been working on my support boat  ( 30' Islander sailboat)  , I'm about ready to haul it out for a bottom painting job and I'm planning on replacing the shaft seal at the same time with the PSS shaft seal.   I think it might have some application to a sub motor shaft seal except it would have to be modified.  The seal occurs between a flat carbon piece and a flat stainless piece.  On a sailboat of course there is hardly any pressure so it a different situation.  But the part that intrigues me is the stainless riding on the carbon as the point of friction for the turning shaft.  This would eliminate using O rings to make the seal , where the o rings could fail.  There would need to be a certain amount of pressure applied to the carbon and stainless pieced but assuming the motors are pressure compensated or oil filled I don't think that would be an issue.   As I haven't entered the "motor phase " of my sub I haven't followed the seal discussions too intently so I may be all wet about this ( can only do one thing at a time!)   Anyway , check out these units, I'd be curious if anyone thinks they may have an application.  http://www.shaftseal.com/en/about/installation_videos  Brian
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